Who is Participating?

More kernel and network parameters can be displayed/set using the commands vmo, ioo, lvmo, schedo, no, nfso, raso.

vmo - Manages Virtual Memory Manager tunable parameters. ioo - Manages Input/Output tunable parameters. lvmo - Manages lvm pbuf tunable parameters. schedo - Manages CPU scheduler tunable parameters. no - Manages network tuning parameters. nfso - Manages Network File System (NFS) tuning parameters. raso - Manages RAS options.
You can get help for each of the commands using [cmd] -h , you can list (almost) all settings using [cmd] -a , and you can get a brief description of every tunable parameter using [cmd] -h [tunable].
When making changes, you can have them take effect now (where applicable), at next reboot, or both.
Most of the above is also accessible via smitty - usesmitty tuning
Selecting the desired tuning area, selecting 'Change/Show...', positioning the cursor at the desired value and pressing <F1> gives help information.
wmp

Hi,
shmmax (max. size of a shared memory segment) is not settable on AIX.
Fixed values are 256 MB for 32-bit systems and 2 GB for 64-bit systems.
smitty can set some values. Use 'smitty chgsys' to view.
wmp